<div class="modal-header">
    <h3 class="modal-title text-center">投票二维码</h3>
</div>
<div class="modal-body text-center">
    <img ng-src="{{img}}" alt="..." class="img-thumbnail">
</div>
<div class="modal-footer">
    <button class="btn btn-primary" type="button" ng-click="ok()">OK</button>
</div>